MPLX LP

8. Segment Information

MPLX’s chief operating decision maker (“CODM”) is the chief executive officer of its general partner. The CODM reviews MPLX’s discrete financial information, makes operating decisions, assesses financial performance and allocates resources on a product-based value chain basis. MPLX hastwo reportable segments: Crude Oil and Products Logistics and Natural Gas and NGL Services. Each of these segments is organized and managed based upon the product-based value chain each supports.

•Crude Oil and Products Logistics – gathers, transports, stores and distributes crude oil, refined products, other hydrocarbon-based products and renewables. Also includes the operation of refining logistics, fuels distribution and inland marine businesses, terminals, rail facilities, and storage caverns.

•Natural Gas and NGL Services – gathers, treats, processes and transports natural gas; and transports, fractionates, stores and markets NGLs.

The CODM evaluates the performance of our segments using Segment Adjusted EBITDA. The CODM uses Segment Adjusted EBITDA results and considers forecast-to-actual variances on a periodic basis when making decisions about allocating capital and personnel as a part of the annual business plan process and ongoing monitoring of performance. Amounts included in net income and excluded from Segment Adjusted EBITDA include: (i) depreciation and amortization; (ii) net interest and other financial costs; (iii) income/(loss) from equity method investments; (iv) distributions and adjustments related to equity method investments; (v) impairment expense; (vi) noncontrolling interests; (vii) transaction-related costs and (viii) other adjustments, as applicable. These items are either: (i) believed to be non-recurring in nature; (ii) not believed to be allocable or controlled by the segment; or (iii) not tied to the operational performance of the segment. Assets by segment are not a measure used to assess the performance of the Partnership by our CODM and thus are not reported in our disclosures.

The tables below present information about our reportable segments:

(1)Within the total segment revenues and other income amounts presented above, third-party revenues for the Crude Oil and Products Logistics segment were $189 million and $508 million for the three and nine months ended September 30, 2026, respectively, and $201 million and $565 million for the three and nine months ended September 30, 2025, respectively. Third-party revenues for the Natural Gas and NGL Services segment were $1,669 million and $4,482 million for the three and nine months ended September 30, 2026, respectively, and $1,917 million and $4,682 million for the three and nine months ended September 30, 2025, respectively.

(2)Other segment items in the Crude Oil and Products Logistics segment include income from equity method investments, distributions and adjustments related to equity method investments, equity-based compensation and other miscellaneous items. Other segment items in the Natural Gas and NGL Services segment include income from equity method investments, distributions and adjustments related to equity method investments, unrealized derivative gain/(loss) and other miscellaneous items.

(3)See below for the reconciliation from Segment Adjusted EBITDA to Net income.

(4)Investments in unconsolidated affiliates for the three and nine months ended September 30, 2026 and September 30, 2025 include cash contributions to several joint ventures to fund current growth capital projects. Investments in unconsolidated affiliates for the nine months ended September 30, 2025 exclude $151 million related to the acquisition of an additional interest in the joint venture that owns and operates the Matterhorn Express Pipeline, and the three and nine months ended September 30, 2025 exclude a $49 million capital contribution to WPC Parent, LLC to purchase Enbridge’s special membership interest in the Bay Runner Pipeline project and a $13 million payment related to earnout associated with MXP Parent, LLC.

(5)The three and nine months ended September 30, 2025 represent the gain on remeasurement of our existing equity investment in BANGL in conjunction with the BANGL Acquisition.

The table below provides a reconciliation of Segment Adjusted EBITDA for reportable segments to Net income.

(1)Depreciation and amortization attributable to Crude Oil and Products Logistics was $154 million and $443 million for the three and nine months ended September 30, 2026, respectively, and $139 million and $407 million for the three and nine months ended September 30, 2025, respectively. Depreciation and amortization attributable to Natural Gas and NGL Services was $224 million and $658 million for the three and nine months ended September 30, 2026, respectively, and $207 million and $589 million for the three and nine months ended September 30, 2025, respectively.

(2)Transaction-related costs include costs associated with acquisition and divestiture-related activities, including significant transactions discussed in Note 3.

(3)Includes unrealized derivative gain/(loss), equity-based compensation, provision for income taxes, and other miscellaneous items.